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We analyze the effect of twists on the electronic structure of configurationsof infinite stacks of graphene layers. We focus on three different cases: aninfinite stack where each layer is rotated with respect to the previous one bya fixed angle, two pieces of semi-infinite graphite rotated with respect toeach other, and finally a single layer of graphene rotated with respect to agraphite surface. In all three cases we find a rich structure, with sharpresonances and flat bands for small twist angles. The method used can be easilygeneralized to more complex arrangements and stacking sequences.

Twists and The Electronic Structure of Graphitic Materials